This is a multicenter, open-label phase Ib study, evaluating the safety, tolerability, preliminary efficacy and PK characteristics of Rocbrutinib (LP-168) combined with R-GemOx in patients with R/R non-GCB DLBCL. Study includes dose escalation part and dose expansion part. In the dose escalation part, a classic "3+3" design will be used to assess the safety of each specified dose combination. Upon completion of a predefined escalation part, the decision on whether to proceed to the dose expansion part will be based on the safety, PK, and efficacy data of the combination regimen.